US9277537B2 - Method for triggering aperiodic sounding reference symbol, base station and user equipment - Google Patents

Method for triggering aperiodic sounding reference symbol, base station and user equipment Download PDF

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US9277537B2
US9277537B2 US13/936,709 US201313936709A US9277537B2 US 9277537 B2 US9277537 B2 US 9277537B2 US 201313936709 A US201313936709 A US 201313936709A US 9277537 B2 US9277537 B2 US 9277537B2
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random access
user equipment
base station
reference symbol
transmit
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US20130294382A1 (en
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Haibo Xu
Hua Zhou
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Fujitsu Ltd
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Fujitsu Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0833—Random access procedures, e.g. with 4-step access
    • H04W76/066—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/34—Selective release of ongoing connections
    • H04W76/36—Selective release of ongoing connections for reassigning the resources associated with the released connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H04W76/38—Connection release triggered by timers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/002—Transmission of channel access control information

Definitions

  • This invention relates to the field of communications, and more particularly, to a method for triggering an aperiodic sounding reference symbol, to a base station and to a user equipment.
  • the sounding reference symbol is used to measure uplink radio channel state information (CSI) between a user equipment (UE) and a base station, e-NodeB (eNB).
  • CSI uplink radio channel state information
  • the UE In the long-term Evolution (LTE) system, the UE periodically transmits the uplink SRS on the last data symbol of a transmission sub-frame according to such parameters indicated by the base station eNB as transmission bandwidth, starting position of frequency domain, cyclic shift of sequence, period and sub-frame offset, etc.
  • the base station eNB judges the uplink CSI of the UE according to the received SRS, and performs operations of frequency domain selection scheduling, closed-loop power controlling, and so on according to the CSI as obtained.
  • aperiodic SRS In the Long-term Evolution-Advanced (LTE-A) system, in order to improve the utilization rate of SRS resources and to enhance flexibility in scheduling of the resources, an aperiodic SRS mechanism is further introduced.
  • periodic SRSs are hereinafter referred to as periodic SRSs
  • aperiodically transmitted SRSs are referred to as aperiodic SRSs.
  • DCI downlink control information
  • the base station eNB can configure for the UE a resource set used to transmit the aperiodic SRS by signaling of a radio resource control (RRC) layer.
  • RRC radio resource control
  • the UE in order to transmit the uplink data, the UE firstly needs to perform random access 1) after time-over of an uplink time advance timer (TAT) of the UE occurs, and 2) after a maximum number of transmissions for the UE to transmit a scheduling request (SR) to the base station over a physical uplink control channel (PUCCH) has been reached.
  • TAT uplink time advance timer
  • SR scheduling request
  • PUCCH physical uplink control channel
  • the base station eNB In order to effectively schedule uplink physical resources necessary for the UE to transmit the uplink data, it is firstly necessary for the base station eNB to obtain the uplink CSI of the UE.
  • the base station eNB In order to obtain the uplink CSI of the UE, it is only possible for the base station to perform channel estimation with periodic SRSs transmitted from the UE. However, after occurrence of the aforementioned two circumstances, the UE will release periodic SRSs resources. Accordingly, the currently feasible method is that the base station eNB needs to configure the resources used to transmit the periodic SRS for the UE by signaling of the RRC layer.
  • the UE does not transmit the periodic SRS immediately, but waits until the coming of the transmission time, and transmits the periodic SRS to the base station eNB at preconfigured transmission time.
  • the base station eNB obtains the uplink CSI from the SRS to thereby schedule resources according to the CSI.
  • the inventors found the following defects in the prior art during the process of developing the present invention: since it is firstly necessary for the base station to configure resources used to transmit the periodic SRS for the UE by signaling of the RRC layer, while it is necessary for the UE to wait for the coming of the transmission time before transmitting the SRS to the base station eNB, a relatively great time delay occurs when the uplink CSI is obtained by the base station eNB, thereby making it impossible for the base station eNB to rapidly schedule the UE when uplink data need to transmit. Further, under the aforementioned circumstances, there is no effective method of obtaining channel state information by making use of aperiodic SRS in the LTE-A system.
  • Certain embodiments aim to provide a method for triggering an aperiodic sounding reference symbol, a base station and a user equipment, in which the user equipment (UE) may not release resources configured for it by the base station to transmit an aperiodic sounding reference symbol (SRS) after time-over of a time advance timer (TAT) or after failure to transmit a scheduling request (SR) over PUCCH (a maximum number of transmissions of the scheduling request has been reached), and can transmit the aperiodic SRS to the base station by making use of the resources, so that the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for a transmission of uplink data of the UE.
  • SRS aperiodic sounding reference symbol
  • TAT time advance timer
  • SR scheduling request
  • CSI uplink channel state information
  • a method for triggering an aperiodic sounding reference symbol comprising:
  • executing a random access procedure by the user equipment and transmitting by the user equipment the aperiodic sounding reference symbol on the unreleased resource used for transmitting an aperiodic sounding reference symbol configured by a base station for the user equipment according to indication information issued by the base station for indicating the user equipment to transmit an aperiodic sounding reference symbol if the random access succeeds.
  • a method for triggering an aperiodic sounding reference symbol comprising:
  • a method for triggering an aperiodic sounding reference symbol comprising:
  • the random access response message containing indication information indicating a user equipment whether to transmit an aperiodic sounding reference symbol, to enable the user equipment to determine whether to transmit the aperiodic sounding reference symbol according to the type of the indication information.
  • a user equipment comprising:
  • a first resource processing unit for not releasing a resource used for transmitting an aperiodic sounding reference symbol configured by a base station for the user equipment when the user equipment desynchronizes or the user equipment fails to transmit a scheduling request to the base station;
  • a first random access unit for executing a random access procedure; and a first information transmitting unit for transmitting the aperiodic sounding reference symbol on the unreleased resource used for transmitting an aperiodic sounding reference symbol configured by the base station for the user equipment according to indication information issued by the base station for indicating the user equipment to transmit an aperiodic sounding reference symbol when the random access succeeds.
  • a user equipment comprising:
  • a second resource processing unit for not releasing a resource used for transmitting an aperiodic sounding reference symbol configured by a base station for the user equipment when the user equipment desynchronizes or the user equipment fails to transmit a scheduling request to the base station;
  • a first determining unit for determining whether to transmit an aperiodic sounding reference symbol according to the type of indication information contained in a random access response message transmitted by the base station indicating the user equipment whether to transmit an aperiodic sounding reference symbol;
  • a second information transmitting unit for transmitting the aperiodic sounding reference symbol on the unreleased resource used for transmitting an aperiodic sounding reference symbol configured by the base station for the user equipment when the user equipment determines to transmit the aperiodic sounding reference symbol.
  • a base station comprising:
  • a third receiving unit for receiving a random access preamble transmitted by an user equipment
  • a message generating unit for generating a corresponding random access response message according to a preconfigured format of the random access response message or according to the preconfigured format of the random access response message corresponding to the type of the random access, wherein indication information indicating whether the user equipment to transmit an aperiodic sounding reference symbol is contained in the random access response message;
  • a third information transmitting unit for transmitting to the user equipment the random access response message such that the user equipment determines whether to transmit an aperiodic sounding reference symbol according to the type of the indication information contained in the random access response message.
  • a computer-readable program wherein when the program is executed in a user equipment, the program enables the computer to carry out the method for triggering an aperiodic sounding reference symbol in the user equipment.
  • a storage medium in which a computer-readable program is stored, wherein the computer-readable program enables the computer to carry out the method for triggering an aperiodic sounding reference symbol in a user equipment.
  • a computer-readable program wherein when the program is executed in a base station, the program enables the computer to carry out the method for triggering an aperiodic sounding reference symbol in the base station.
  • a storage medium in which a computer-readable program is stored, wherein the computer-readable program enables the computer to carry out the method for triggering an aperiodic sounding reference symbol in the base station.
  • the user equipment does not release the resource configured for it by the base station to transmit an aperiodic sounding reference symbol (SRS) after time-over of a time advance timer (TAT) or after failure to transmit a scheduling request (SR) over PUCCH (a maximum number of transmissions of the scheduling request has been reached), and after receipt from the base station of indication information indicating it to transmit the aperiodic SRS, makes use of the unreleased and preconfigured resource to transmit the aperiodic SRS to the base station according to the indication information, so that the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for a transmission of uplink data of the UE.
  • SRS aperiodic sounding reference symbol
  • TAT time advance timer
  • SR scheduling request
  • PUCCH a maximum number of transmissions of the scheduling request has been reached
  • FIG. 1 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 1;
  • FIG. 2A is a flowchart of a contention-base random access procedure
  • FIG. 2B is a flowchart of a contention-free random access procedure
  • FIG. 3 is a structural diagram of a user equipment according to Embodiment 2;
  • FIG. 4 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 3;
  • FIG. 5 is one of the flowcharts for carrying out step 403 in Embodiment 3;
  • FIG. 6 is another one of the flowcharts for carrying out step 403 in Embodiment 3;
  • FIG. 7 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 4.
  • FIG. 8 is a schematic diagram of the format of an RAR message in prior art
  • FIG. 9 is a format schematic diagram of the RAR message showing that a reserved bit “R” in an RAR message is used to carry indication information;
  • FIG. 10 is a format schematic diagram of the RAR message showing that a newly added bit in an RAR uplink bandwidth grant field is used to carry indication information;
  • FIG. 11 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 5;
  • FIG. 12 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 6;
  • FIG. 13 is a structural diagram of a user equipment according to Embodiment 7.
  • FIG. 14 is one of the structural diagrams of the first determining unit of Embodiment 7;
  • FIG. 15 is another one of the structural diagrams of the first determining unit of Embodiment 7.
  • FIG. 16 is a structural diagram of a base station according to Embodiment 8.
  • FIG. 1 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 1. As shown in FIG. 1 , the method comprises the following steps:
  • Step 101 in which a user equipment (UE) does not release a resource used for transmitting an aperiodic sounding reference symbol (SRS) configured by a base station for the user equipment (UE), if the user equipment (UE) desynchronizes or the user equipment (UE) fails to transmit a scheduling request (SR) to the base station;
  • SRS aperiodic sounding reference symbol
  • Step 102 in which a random access procedure is executed by the user equipment (UE).
  • Step 103 in which if the random access succeeds, according to indication information for, which is issued by the base station, indicating the user equipment (UE) to transmit an aperiodic sounding reference symbol (SRS), the user equipment (UE) transmits the aperiodic sounding reference symbol (SRS) on the unreleased resource, which is configured by the base station for the user equipment (UE) with respect to the transmission of aperiodic sounding reference symbol (SRS).
  • indication information for which is issued by the base station, indicating the user equipment (UE) to transmit an aperiodic sounding reference symbol (SRS)
  • the user equipment (UE) transmits the aperiodic sounding reference symbol (SRS) on the unreleased resource, which is configured by the base station for the user equipment (UE) with respect to the transmission of aperiodic sounding reference symbol (SRS).
  • Step 101 of this embodiment if time-over occurs at a time advance timer (TAT) of the UE for maintaining uplink synchronization, it can be determined that the UE desynchronizes.
  • TAT time advance timer
  • the UE When the UE maintains uplink synchronization and desires to transmit uplink data, it transmits a scheduling request to the base station so as to request an uplink resource for transmitting the uplink data. If the uplink resource allocated to the UE by the base station has not yet been obtained until the number of transmissions of the scheduling request (SR) exceeds a predetermined value, it is determined that transmission of the scheduling request by the UE has failed.
  • SR scheduling request
  • Step 101 when the aforementioned circumstance occurs, the UE does not release the resource used for transmitting the aperiodic SRS, so as to make use of the resource to transmit the aperiodic SRS on receipt of indication information sent from the base station indicating to transmit the aperiodic SRS. Accordingly, the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for a transmission of uplink data by the UE.
  • CSI uplink channel state information
  • the UE when the UE desynchronizes in Step 101 and it desires to transmit uplink data to the base station, it is necessary for the UE to execute a random access procedure so as to achieve uplink synchronization and to notify the base station of its desire to transmit the uplink data.
  • the UE that maintains uplink synchronization fails to transmit the SR to the base station in Step 101 , in order to notify the base station of its desire to transmit the uplink data, it is necessary for the UE to transmit the random access procedure.
  • Step 101 the UE executes a random access procedure in Step 102 , in which the random access procedure may either be a contention-free or contention-base random access, and the procedure is similar to that of the prior art.
  • Contention-base and contention-free random access procedures are briefly described below with reference to FIGS. 2A and 2B .
  • FIG. 2A is a flowchart of a contention-base random access procedure according to Embodiment 1.
  • random access is initiated by the UE or triggered by the base station.
  • Example is taken here with the UE initiating the random access for explanation.
  • Step 201 in which the UE transmits a random access preamble to the base station
  • Step 202 in which the base station receives the random access preamble, and returns a random access response (RAR) message to the UE;
  • RAR random access response
  • the RAR message may include such information as time adjustment information for uplink synchronization, initial allocation of uplink resources (subsequent Msg3 to be transmitted by the user), and temporary radio network temporary identifier C-RNTI, etc.;
  • Step 203 in which the UE obtains uplink time synchronization and an uplink resource after receipt of the RAR message; however, since it is by now impossible to determine whether the RAR message is transmitted to the UE or to other user equipment, the UE transmits an Msg3 message to the base station so as to resolve the above random access conflict; moreover, the UE simultaneously starts a mac-contention resolution timer;
  • the Msg3 message carries therein identification information of the UE to differentiate different user equipments
  • Step 204 in which the UE receives a contention resolution message returned from the base station in the case time-over does not occur at the mac-contention resolution timer, and then the UE can determine that the random access succeeds this time; otherwise, the random access procedure fails.
  • FIG. 2B is a flowchart of a contention-free random access procedure according to Embodiment 1, in which the contention-free random access procedure is triggered by the base station.
  • the base station notifies the UE in advance of using particular contention-free random access preamble sequence and resource to access, and thus it is possible to avoid possible conflict and reduce time delay of the random access. Since no problem concerning conflict needs be resolved, the contention-free random access procedure is relatively simple. As shown in FIG. 2B , the following steps are included:
  • Step 201 ′ in which the base station notifies the UE in advance to use particular contention-free random access preamble sequence and resource;
  • Step 202 ′ in which the UE transmits to the base station a particular contention-free random access preamble according to the particular random access preamble sequence notified by the base station;
  • Step 203 ′ in which the base station receives the random access preamble, can determine the contention-free random access initiated by the UE according to the preamble identifier, and returns an RAR message to the UE;
  • the RAR message may include such information as time adjustment information for uplink synchronization, resources allocated to the UE necessary for transmitting uplink data, and temporary radio network temporary identifier C-RNTI, etc.
  • Step 103 when the UE receives indication information for, which is issued from the base station, indicating the UE to transmit the aperiodic SRS, the aperiodic SRS is transmitted on the unreleased resource.
  • the base station can rapidly obtain uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for a transmission of uplink data of the UE.
  • CSI uplink channel state information
  • the base station may make use of physical downlink control information (DCI) to transmit indication information indicating the UE to transmit the aperiodic SRS, and the physical DCI is transmitted over a physical downlink control channel (PDCCH).
  • DCI physical downlink control information
  • the format whereby the physical DCI is carried over the PDCCH is referred to as the downlink control information (DCI) format.
  • the DCI format is divided into 10 types as DCI format 0, format 1, format 1A, format 1B, format 1C, format 1D, format 2, format 2A, format 3, and format 3A.
  • a DCI format 4 is further included besides the aforementioned 10 types of DCI format.
  • the base station may trigger the UE to transmit the aperiodic SRS by DCI format 0 or DCI format 4.
  • DCI format 0 When DCI format 0 is used to trigger the UE to transmit the aperiodic SRS, a new bit is added to the DCI format 0.
  • the base station may trigger the UE to transmit the aperiodic SRS with the newly added bit. For example, when the bit is 1, the UE is indicated to transmit the aperiodic SRS.
  • the resource set necessary to transmit the aperiodic SRS is preconfigured by high level signaling, namely radio resource control (RRC) protocol. Moreover, there is only one resource set available for selection. When the bit is 0, the UE is indicated not to transmit the aperiodic SRS.
  • RRC radio resource control
  • Table 1 illustrates the carrying information and length for DCI format 0 in the LTE system according to the embodiments, wherein the bit that carries the indication information is 1 bit.
  • DCI format 4 When DCI format 4 is used to trigger the UE to transmit the aperiodic SRS, two bits (2 bit) are provided in the DCI format 4 to carry the indication information.
  • the resource set needed to transmit the aperiodic SRS is preconfigured by RRC signaling, and three resource sets shall be configured at the same time.
  • the three states for triggering the aperiodic SRS in DCI format 4 respectively correspond to the three resource sets used for transmitting the aperiodic SRS after the trigger.
  • Table 2 illustrates the carrying information and length for DCI format 4 in the LTE-A system according to certain embodiments, wherein the bit that carries the indication information is 2 bit.
  • the UE can read indication information therefrom, and if it is determined that the indication information indicates the UE to transmit the aperiodic SRS, the UE transmits the aperiodic SRS on the unreleased resource.
  • the aperiodic SRS is transmitted with DCI format 1A and so on.
  • the indicating mode is similar to those of DCI format 0 and DCI format 4, and is hence not repetitively described here. But there is no restriction here, as any other information could also be used to carry.
  • the UE does not release the resource configured for it by the base station to transmit the aperiodic SRS after time-over of the time advance timer (TAT) or after failure to transmit the scheduling request (SR) over PUCCH (a maximum number of transmissions of the scheduling request has been reached).
  • TAT time advance timer
  • SR scheduling request
  • the UE after the UE succeeds in the random access and receives the indication information sent from the base station indicating it to transmit the aperiodic SRS, it can make use of the unreleased resource to transmit the aperiodic SRS to the base station according to the indication information, so that the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for an uplink data transmission of the UE.
  • CSI uplink channel state information
  • Embodiments of the present invention further provide a user equipment, as described in greater detail in the following embodiment. Since the principles whereby the user equipment resolves the problem are similar to the principles whereby the method for triggering a sounding reference symbol based on the user equipment solves the problem, implementation of the user equipment may refer to the implementation of the method, and repetitive contents will not be reiterated in this context.
  • FIG. 3 is a structural diagram of a user equipment according to Embodiment 2. As shown in FIG. 3 , the user equipment includes a first resource processing unit 301 , a first random access unit 302 and a first information transmitting unit 303 .
  • the first resource processing unit 301 does not release a resource used for transmitting an aperiodic sounding reference symbol configured by a base station for the user equipment (UE) when the user equipment (UE) desynchronizes or the user equipment (UE) fails to transmit a scheduling request (SR) to the base station.
  • the first random access unit 302 executes a random access procedure; the process of interaction between the random access unit 302 and the base station is as shown in Embodiment 1 and FIGS. 2A and 2B , and no repetition will be made here.
  • the first information transmitting unit 303 transmits the aperiodic sounding reference symbol (SRS) on the unreleased resource configured by the base station for the user equipment with respect to the transmission of aperiodic sounding reference symbol (SRS) according to indication information issued by the base station for indicating the user equipment to transmit an aperiodic sounding reference symbol (SRS) when the random access succeeds.
  • SRS aperiodic sounding reference symbol
  • the indication information issued by the base station can be carried by DCI format 0 or DCI format 4 or DCI format 1A, which is not restricted, as any other information could as well be used to carry, as shown in Embodiment 1, and no repetition will be made here.
  • the UE does not release the resource configured for it by the base station to transmit an aperiodic SRS after time-over of a time advance timer (TAT) or after failure to transmit a scheduling request (SR) over PUCCH (a maximum number of transmissions of the scheduling request has been reached).
  • TAT time advance timer
  • SR scheduling request
  • the UE after the UE succeeds in random access and receives the indication information sent from the base station indicating it to transmit an aperiodic SRS, it can make use of the unreleased resource to transmit the aperiodic SRS to the base station according to the indication information, so that the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for an uplink data transmission of the UE.
  • CSI uplink channel state information
  • FIG. 4 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 3. As shown in FIG. 4 , the method comprises the following steps:
  • Step 401 in which a user equipment (UE) does not release a resource used for transmitting an aperiodic sounding reference symbol (SRS) configured by a base station for the user equipment (UE), if the user equipment (UE) desynchronizes or the user equipment (UE) fails to transmit a scheduling request (SR) to the base station;
  • SRS aperiodic sounding reference symbol
  • Step 402 in which the user equipment (UE) executes a random access procedure, which may either be a contention-based or contention-free random access procedure; the procedure is as shown in FIGS. 2A and 2B of Embodiment 1, where the user equipment (UE) transmits a random access preamble on its own initiative or under trigger by the base station;
  • Step 403 in which the user equipment (UE) determines whether to transmit an aperiodic sounding reference symbol (SRS) according to the type of indication information for, which is contained in a random access response message returned by the base station in the random access procedure, indicating the user equipment (UE) whether to transmit an aperiodic sounding reference symbol (SRS);
  • SRS aperiodic sounding reference symbol
  • Step 404 in which the user equipment (UE) transmits the aperiodic sounding reference symbol (SRS) on the unreleased resource used for transmitting an aperiodic sounding reference symbol (SRS) configured by the base station for the user equipment (UE) if the user equipment (UE) determines to transmit the aperiodic sounding reference symbol (SRS).
  • SRS aperiodic sounding reference symbol
  • Step 401 when the UE desynchronizes in Step 401 and the UE desires to transmit uplink data to the base station, it needs to execute a random access procedure so as to achieve uplink synchronization and to notify the base station of its desire to transmit the uplink data.
  • the UE that maintains uplink synchronization fails to transmit the SR to the base station in Step 401 , it needs to transmit the random access procedure so as to notify the base station of its desire to transmit the uplink data.
  • Step 402 the UE executes a random access procedure, and the UE transmits a random access preamble to the base station.
  • the base station can generate and return an RAR message containing indication information indicating the UE to transmit an aperiodic SRS, the process of which will be described below.
  • the indication information indicates the UE to transmit the aperiodic SRS; otherwise, the indication information indicates the UE not to transmit the aperiodic SRS.
  • Step 403 when the UE receives the RAR message, it can read the indication information, and determine whether to transmit the aperiodic SRS according to the type of the indication information. The specific determining process will be described below with reference to FIGS. 5 and 6 .
  • the indication information contained in the RAR message is carried by a reserved bit R in the random access response message.
  • it is carried by a newly added bit, and in this case, a bit can be newly added in an uplink bandwidth grant (UL Grant) field to carry the indication information, but the total number of bits in the RAR message remains unchanged.
  • UL Grant uplink bandwidth grant
  • the number of bit may be 1, for instance, when the state corresponding to the 1 bit is “1”, this represents indicating the UE to transmit the aperiodic SRS; when the state corresponding to the 1 bit is “0”, this represents indicating the UE not to transmit the aperiodic SRS.
  • the aforementioned bit there is no restriction to the aforementioned bit, as any other bit may as well be used to carry the indication information.
  • the RAR message can correspond to different formats, and RAR messages of different formats correspond to different processing modes.
  • the format of the RAR message can be preconfigured by the base station and notified to the UE, so that the UE performs a corresponding process according to the configured format on receipt of the RAR message.
  • the base station preconfigures the corresponding format of the RAR message according to the type of the random access, and notifies the UE, so that the UE performs a corresponding process according to the configured format corresponding to the type of the random access on receipt of the RAR message.
  • the base station can only configure the format of the random access response message corresponding to a contention-free random access procedure, and notify the UE, so that the UE processes the received RAR message by using the preconfigured format of the random access response message corresponding to the contention-free random access procedure under the circumstance of contention-free random access.
  • the format of the random access response message corresponding to a contention-based random access procedure agreement can be made with the UE to adopt the mode by default, namely the original format.
  • the method further includes the following preparation procedure, namely receiving resource information configured by the base station for the UE to transmit the aperiodic SRS.
  • the following step may further be included.
  • the UE receives the format of the random access response message configured by the base station for the UE; or the UE receives the format of the random access response message corresponding to the type of the random access procedure and configured by the base station for the UE.
  • FIG. 5 is one of the flowcharts for carrying out step 403 in Embodiment 3, in which the format of the RAR message is preconfigured by the base station and notified to the UE, so that the UE performs a corresponding process according to the configured format on receipt of the RAR message.
  • Step 501 in which the UE receives the RAR message returned by the base station according to the random access preamble transmitted by the UE;
  • the RAR message contains indication information indicating the UE whether to transmit an aperiodic SRS, and wherein regardless of a contention-based or contention-free random access procedure, when the base station generates the RAR message, the format of the RAR message is a format preconfigured by the base station.
  • the format of the RAR message can be a format of carrying the indication formation by a newly added bit or a reserved bit R in the random access response message.
  • indication information in the RAR message is set as “0”.
  • the indication information is set as “1”; otherwise, the indication information is set as “0”.
  • Step 502 in which the RAR message is correspondingly processed according to a preconfigured format of the RAR message, so as to obtain the indication information contained in the RAR message;
  • processing the RAR message is to decode the RAR message.
  • Step 503 in which it is determined if the type of the indication information shows to transmit the aperiodic SRS.
  • Step 504 is executed when the determination result is yes, otherwise Step 505 is executed.
  • the indication information is “1”, this represents to transmit the aperiodic SRS; if the indication information is “0”, this represents not to transmit the aperiodic SRS.
  • the aforementioned indication information is merely exemplified in this invention, as any other identifiers may also be used to represent.
  • Step 504 in which the determination result in Step 503 is yes, namely the type of the indication information shows to transmit the aperiodic SRS, and the UE determines to transmit the aperiodic SRS.
  • Step 505 in which the determination result in Step 503 is no, namely the type of the indication information shows not to transmit the aperiodic SRS, and the UE determines not to transmit the aperiodic SRS.
  • the base station regardless of whether the UE executing the contention-free or the contention-based random access procedure at the user side, the base station generates a corresponding RAR message according to the preconfigured RAR format, and the UE can process the received RAR message according to the preconfigured format of the RAR message, so as to obtain the indication information in the RAR message.
  • the type of the indication information is “1”, it can be determined to transmit the aperiodic SRS; if the type of the indication information is “0”, it can be determined not to transmit the aperiodic SRS. Under such a circumstance, the UE does not need to differentiate the types of the random access procedure while processing the received RAR message.
  • FIG. 6 is another one of the flowcharts for carrying out step 403 in Embodiment 3, in which the format of the RAR message is preconfigured by the base station and notified to the UE, and the format of the RAR message corresponds to the type of the random access, so that the UE correspondingly processes the received RAR message according to the type of the RAR message corresponding to the type of the random access on receipt of the RAR message.
  • the base station can only configure the format of the random access response message corresponding to a contention-free random access procedure, and notify the UE.
  • agreement can be made with the UE to adopt the mode by default.
  • Step 601 in which the UE receives the RAR message returned by the base station according to the random access preamble transmitted by the UE;
  • the RAR message contains indication information indicating the UE whether to transmit an aperiodic SRS.
  • the format of the RAR message can be preconfigured by the base station, and corresponds to the type of the random access.
  • the contention-based random access procedure corresponds to the default and original format of the RAR message;
  • the contention-free random access procedure corresponds to the format of the RAR message containing indication information and configured by the base station.
  • the format may be a format of carrying indication information by a reserved bit R in the RAR message; alternatively, the format may be a format of carrying indication information by a newly added bit in the RAR message.
  • the base station when the base station receives the random access preamble transmitted from the UE and generates the RAR message, it can generate the RAR message according to the preconfigured format of the random access response message corresponding to the type of the random access.
  • the default original format in which no indication information is contained is used for the contention-based random access procedure; alternatively, the reserved bit R in the original format is set as “0”, indicating the UE not to transmit the aperiodic SRS.
  • a configured format of the random access response message corresponding to the contention-free random access procedure is used for the contention-free random access procedure, wherein if the base station determines that it is necessary for the UE to transmit the aperiodic SRS, the indication information is set as “1”, otherwise the indication information is set as “0”.
  • Step 602 in which the UE determines whether the type of the random access is a contention-free random access procedure or a contention-based random access procedure; if it is the contention-free random access procedure, Step 603 is executed, otherwise Step 607 is executed.
  • Step 603 in which if the type of the random access is a contention-free random access procedure in Step 602 , the UE correspondingly processes the RAR message according to preconfigured format of the RAR message corresponding to the contention-free random access procedure, so as to obtain indication information contained in the RAR message;
  • processing the RAR message is to decode the RAR message.
  • Step 604 in which it is determined whether the type of the indication information is to transmit the aperiodic SRS; if the determination result is yes, Step 605 is executed, otherwise Step 607 is executed;
  • Step 605 in which the determination result in Step 604 is yes, namely the type of the indication information shows to transmit the aperiodic SRS, then the UE determines to transmit the aperiodic SRS.
  • Step 607 in which the determination result in Step 604 is no, namely the type of the indication information shows not to transmit the aperiodic SRS, then the UE determines not to transmit the aperiodic SRS.
  • Step 606 in which if the type of the random access is a contention-based random access procedure in Step 602 , the UE processes the RAR message according to the default format of the RAR message; as can be known, the RAR message does not contain indication information, or the indication information is “0”, and it is then determined not to transmit the aperiodic SRS.
  • the base station can trigger the UE to transmit the aperiodic SRS with the RAR message of the random access procedure, and the aperiodic SRS is transmitted on the unreleased resource, so that the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for a transmission of uplink data of the UE.
  • CSI uplink channel state information
  • FIG. 7 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 4.
  • the UE since the random access procedure can either be initiated by a UE itself or triggered by a base station, the UE transmits a random access preamble on the initiative of the UE or based on triggering of the base station.
  • indication information indicating the UE to transmit the aperiodic SRS is carried in a returned RAR message, so as to trigger the UE to transmit the aperiodic SRS; otherwise, indication information indicating the UE not to transmit the aperiodic SRS is carried in the returned RAR message.
  • the method comprises the following steps:
  • Step 701 in which the base station receives a random access preamble transmitted from the UE.
  • Step 702 in which a corresponding random access response message is generated according to a preconfigured format of the random access response message, or according to a preconfigured format of the random access response message corresponding to the type of the random access; wherein the random access response message contains indication information indicating the UE whether to transmit the aperiodic SRS.
  • Step 703 in which the random access response message is transmitted to the UE, so that the UE determines whether to transmit the aperiodic SRS according to the type of the indication information contained in the random access response message.
  • the method further comprises triggering the UE by the base station to initiate the random access procedure, which is similar to the prior art, and will not be repetitively described here.
  • indication information indicating the UE to transmit the aperiodic SRS is carried in a returned RAR message, so as to trigger the UE to transmit the aperiodic SRS; otherwise, indication information indicating the UE not to transmit the aperiodic SRS is carried in the returned RAR message.
  • the RAR message may further contain other information of the random access procedure, such as time adjustment information for uplink synchronization, resources allocated to the UE for transmitting uplink data, and temporary radio network temporary identifier C-RNTI, etc.
  • Step 702 when the base station generates the corresponding RAR message according to the preconfigured format of the random access response message, the method specifically includes the following steps: when the base station receives the random access preamble transmitted from the UE, if it is determined according to the random access preamble that the random access procedure of the UE is a contention-based random access procedure, the indication information is set as “0” while generating the RAR message of the preconfigured format; if it is determined that the random access procedure of the UE is a contention-free random access procedure, the base station first determines whether it is necessary for the UE to transmit the aperiodic SRS; if it is determined that it is necessary for the UE to transmit the aperiodic SRS, the indication information can be set as “1”; if it is determined that it is not necessary for the UE to transmit the aperiodic SRS, the indication information can be set as “0”.
  • Step 702 if the base station generates the corresponding random access response message according to the preconfigured format of the random access response message corresponding to the type of the random access, the method specifically includes the following steps.
  • the base station When the base station receives the random access preamble transmitted from the UE, if it is determined according to the random access preamble that the random access procedure of the UE is a contention-based random access procedure, the RAR message of the default original format in which no indication information is contained can be generated; alternatively, the reserved bit R in the original format is set as “0”, indicating the UE not to transmit the aperiodic SRS; if it is a contention-free random access procedure, a configured format of the random access response message corresponding to the contention-free random access procedure is used, wherein if the base station determines that it is necessary for the UE to transmit the aperiodic SRS, the indication information is set as “1”, otherwise the indication information is set as “0”.
  • the indication information contained in the RAR message is carried by a reserved bit in the RAR message or a newly added bit, for instance, by a newly added bit in the uplink bandwidth grant (UL Grant) field.
  • UL Grant uplink bandwidth grant
  • FIG. 8 is a schematic diagram of the format of an RAR message in prior art
  • FIG. 9 is a format schematic diagram of the RAR message showing that a reserved bit “R” in an RAR message is used to carry indication information, wherein the bit representing the indication information is referred to as “S”
  • FIG. 10 is a format schematic diagram of the RAR message showing that a newly added bit in an RAR uplink bandwidth grant field is used to carry indication information.
  • R reserved bit, which is usually set as 0;
  • Time Advance Command for adjusting uplink transmission time of the UE
  • Temporary Cell Radio Network Identifier (Temporary C-RNTI).
  • Uplink Bandwidth Grant (UL Grant), for allocating the resource necessary for the UE to transmit uplink data, totaling 20 bits, and the parameters and number of bits as contained being as shown in Table 3.
  • a reserved bit R is used to carry the indication information, and the reserved bit R is 1 bit.
  • the Rbit is set as a bit “S” that triggers the aperiodic SRS. For instance, if the base station needs to trigger the UE to transmit the aperiodic SRS, S can be set as “1”; if the base station does not need to trigger the UE to transmit the aperiodic SRS, S can be set as “0”.
  • corresponding decoding can be performed to obtain the indication information carried by the bit “S”, and it is determined according to the type of the indication information whether to transmit the aperiodic SRS. Under such a circumstance, the original format of the RAR message is not much changed, and this facilitates practical application.
  • a newly added bit is used to carry the indication information, for instance, a bit is newly added to the uplink bandwidth grant (UL Grant) field to trigger the aperiodic SRS.
  • UL Grant uplink bandwidth grant
  • the number of bits in the UL grant field is 21 bits.
  • the parameters and number of bits contained are as shown in Table 4.
  • the bit of the aperiodic SRS request can be set as “1”; if the base station does not need to trigger the UE to transmit the aperiodic SRS, the bit of the aperiodic SRS can be set as “0”.
  • the UE receives the RAR message of a format as shown in FIG. 10 the corresponding decoding is performed to obtain the indication information carried by the aperiodic SRS request, and it is determined according to the type of the indication information whether to transmit the aperiodic SRS.
  • the original format of the RAR message is relatively greatly changed.
  • the total number of bits of the RAR message remains unchanged, as what is changed is merely the format of the RAR message, by adding the originally reserved bit R to the UL grant field.
  • the RAR message can correspond to different formats, and RAR messages of different formats correspond to different processing modes.
  • the format of the RAR message can be preconfigured by the base station and notified to the UE, so that the UE performs a corresponding process according to the configured format on receipt of the RAR message.
  • the base station preconfigures the corresponding format of the RAR message according to the type of the random access (that is to say, the format as shown in FIG. 9 or 10 can be configured for the contention-free random access procedure, while the format as shown in FIG. 8 can be configured for the contention-based random access procedure), and notifies the UE, so that the UE performs a corresponding process according to the configured format corresponding to the type of the random access on receipt of the RAR message.
  • the method may further include the following steps: the base station configures resource information used for the UE to transmit the aperiodic SRS, and the configured resource information is notified to the UE by radio resource control (RRC) signaling.
  • RRC radio resource control
  • the radio resource control signaling can be RRC connection setup signaling, or RRC connection reconfiguration signaling, or RRC connection reestablishment signaling.
  • RRC connection setup signaling or RRC connection reconfiguration signaling, or RRC connection reestablishment signaling.
  • the method further includes the following steps: the base station configures the format of the RAR message for the UE; the configured format of the RAR message is notified to the UE, so that the UE correspondingly processes the received RAR message according to the format of the random access response message.
  • the base station configures the format of the RAR message for the UE; the configured format of the RAR message is notified to the UE, so that the UE correspondingly processes the received RAR message according to the format of the random access response message.
  • the base station if the format of the RAR message is preconfigured, then in Step 701 , after the base station receives the random access preamble transmitted from the UE, the base station generates the corresponding RAR message according to the preconfigured format of the RAR message, so that the UE performs a corresponding process after receiving the RAR message.
  • the format of the RAR message is preconfigured.
  • the method further includes the following steps: the base station configures for the UE a format of the RAR message corresponding to the contention-free random access procedure; the configured format of the RAR message corresponding to the random access procedure is notified to the UE, so that the UE performs a corresponding process on the received RAR message according to the random access procedure and the format of the RAR message corresponding to the random access procedure.
  • the format of the RAR message can be preconfigured as the format shown in FIG. 8 ; if the random access procedure is contention-free, the format of the RAR message can be preconfigured as the format shown in FIG.
  • Step 701 after the base station receives the random access preamble transmitted from the UE, the base station generates the corresponding RAR message according to the type of contention of the random access, so that the UE performs the corresponding process according to the type of contention of the random access after receiving the RAR message.
  • the base station when the base station receives the random access preamble transmitted from the UE, the base station can return an RAR message in a corresponding format according to preconfiguration, so that the UE processes the RAR message according to the preconfigured format after receiving the RAR message transmitted from the base station to thereby obtain the corresponding indication information.
  • the indication information indicates the UE to transmit the aperiodic SRS
  • unreleased resource is used to transmit the aperiodic SRS to the base station, so that the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for a transmission of uplink data of the UE.
  • CSI uplink channel state information
  • FIG. 11 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 5, in which the format of the RAR message as preconfigured by the base station being the format shown in FIG. 9 or 10 is taken for example for explanation, and this format is used regardless of a contention-based or contention-free random access procedure.
  • the method comprises the following steps:
  • Step 1101 in which the procedure is prepared
  • the base station configures resource information used for the UE to transmit the aperiodic SRS, and the configured resource information is notified to the UE through radio resource control (RRC) signaling;
  • RRC radio resource control
  • the base station configures for the UE a format of the random access response (RAR) message, for instance, the format as shown in FIG. 9 , and notifies the UE;
  • RAR random access response
  • the UE After receiving the resource information transmitted from the base station, the UE stores the resource information, and after receiving the format of the RAR message configured by the base station, the UE stores format information.
  • Step 1102 in which if the UE desynchronizes or the UE fails to transmit a scheduling request (SR) to the base station, the UE does not release the resource configured by the base station for the UE to transmit the aperiodic SRS;
  • SR scheduling request
  • Step 1103 in which the UE executes a random access procedure
  • the UE transmits to the base station a particular conflict-free random access preamble according to a particular random access preamble sequence notified by the base station.
  • Step 1104 in which the base station receives the random access preamble transmitted from the UE, and determines the random access procedure as contention-free random access according to the random access preamble.
  • Step 1105 in which the base station generates an RAR message according to a preconfigured format of the RAR message, and returns the RAR message to the UE;
  • the RAR message contains indication information indicating the UE whether to transmit the aperiodic SRS, wherein when the RAR message is generated, if the base station determines that it is necessary for the UE to transmit the aperiodic SRS, the indication information can be set as “1”; if it is determined that it is not necessary for the UE to transmit the aperiodic SRS, the indication information can be set as “0”.
  • Step 1106 in which the UE receives the RAR message, and correspondingly processes the RAR message according to the preconfigured format of the RAR message, to obtain the indication information.
  • Step 1107 in which it is determined whether the type of the indication information shows to transmit the aperiodic SRS; if the determination result is yes, Step 1108 is executed, otherwise Step 1110 is executed.
  • Step 1108 in which the determination result is yes in Step 1107 , then the UE determines to transmit the aperiodic SRS.
  • Step 1109 in which the UE transmits the aperiodic SRS on an unreleased resource allocated by the base station to the UE.
  • Step 1110 in which the determination result is no in Step 1107 , then the UE determines not to transmit the aperiodic SRS.
  • Step 1103 of Embodiment 5 illustrated by FIG. 11 if the UE executes the random access procedure, and in this case, if the UE initiates a contention-based random access, the UE transmits a contention-based random access preamble to the base station.
  • the base station receives the random access preamble transmitted from the UE, and determines the random access procedure as contention-based random access according to the random access preamble.
  • the base station generates an RAR message according to a preconfigured format of the RAR message, and returns the RAR message to the UE; wherein the RAR message contains indication information indicating the UE whether to transmit the aperiodic SRS; and wherein when the RAR message is generated, the base station sets the indication information as “0”.
  • the remaining steps are similar to those shown in FIG. 11 , and are not repetitively described here.
  • the UE when the UE initiates the contention-based random access procedure, if the RAR message returned by the base station is received, it is possible to determine not to transmit the aperiodic SRS according to the type of the indication information contained in the RAR message.
  • FIG. 12 is a flowchart of a method for triggering an aperiodic sounding reference symbol according to Embodiment 6, in which the base station preconfiguring a format of the RAR message corresponding to the type of the random access is taken as example for explanation, wherein in the case of a contention-based random access, the configured format is the format as shown in FIG. 8 ; in the case of a contention-free random access, the configured format is the format as shown in FIG. 9 or 10 .
  • the method comprises the following steps:
  • Step 1201 in which the procedure is prepared
  • the base station configures resource information used for the UE to transmit the aperiodic SRS, and the configured resource information is notified to the UE through radio resource control signaling;
  • radio resource control signaling is as previously described, and no repetition will be made here;
  • the base station configures for the UE a format of the random access response (RAR) message corresponding to the type of the random access, and notifies the UE;
  • RAR random access response
  • the UE After receiving the resource information transmitted from the base station, the UE stores the resource information, and after receiving the format of the RAR message corresponding to the type of the random access configured by the base station, the UE stores format information.
  • Step 1202 in which if the UE desynchronizes or the UE fails to transmit a scheduling request (SR) to the base station, the UE does not release the resource configured by the base station for the UE to transmit the aperiodic SRS.
  • SR scheduling request
  • Step 1203 in which the UE executes a random access procedure
  • the UE transmits to the base station a particular conflict-free random access preamble according to a particular random access preamble sequence notified by the base station.
  • the UE If the UE initiates a contention-based random access, the UE transmits to the base station a contention-based random access preamble.
  • Step 1204 in which the base station receives the random access preamble transmitted from the UE, and determines the type of the random access procedure according to the random access preamble.
  • Step 1205 in which the base station generates an RAR message according to a preconfigured format of the RAR message corresponding to the type of the random access, and returns the RAR message to the UE;
  • an RAR message of the format shown in FIG. 8 is generated, wherein the RAR message does not contain indication information, or the reserved bit in the format as shown in FIG. 8 is set as “0”;
  • the base station If the type of the random access is a contention-free random access procedure, the base station generates an RAR message of a format shown in FIG. 9 or 10 according to preconfiguration, and the RAR message contains indication information indicating the UE whether to transmit the aperiodic SRS; if it is needed for the UE to transmit the aperiodic SRS, the indication information can be “1”, otherwise the indication information can be “0”.
  • Step 1206 in which the UE receives the RAR message.
  • Step 1207 in which it is determined whether the type of the random access is a contention-free or a contention-based random access procedure; if the determination result shows a contention-free random access procedure, Step 1208 is executed, otherwise Step 1212 is executed.
  • Step 1208 in which if the determination result in Step 1207 shows the contention-free random access, the UE correspondingly processes the RAR message according to the preconfigured format of the RAR message corresponding to the contention-free random access, to obtain indication information contained in the RAR message.
  • Steps 1209 - 1211 and 1213 are similar to Steps 1107 - 1110 as shown in FIG. 11 , and are hence not repetitively described here.
  • Step 1212 in which if the determination result in Step 1207 shows the contention-based random access, the UE correspondingly processes the RAR message according to the preconfigured format of the RAR message corresponding to the contention-based random access, such as the format shown in FIG. 8 ; if no indication information is obtained or if the indication information as obtained is “0”, the UE determines not to transmit the aperiodic SRS.
  • the base station can preconfigure the resource set for the UE to transmit the aperiodic SRS and the format of the RAR message, and notify the UE; after time-over of a time advance timer (TAT) or after failure to transmit a scheduling request (SR) over PUCCH (a maximum number of transmissions of the scheduling request has been reached), the UE does not release the resource configured for it by the base station to transmit the aperiodic SRS; it is possible to determine to transmit the aperiodic SRS according to the indication information in the random access response message of the random access procedure transmitted by the base station, and to transmit the aperiodic SRS on the unreleased resource, so that the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for a transmission of uplink data of the UE.
  • TAT time advance timer
  • SR scheduling request
  • Certain embodiments further provide a base station and a user equipment, as described with reference to the embodiments below. Since the principles whereby the base station and the user equipment resolve the problems are similar to the principles whereby the methods for triggering a sounding reference symbol based on the base station and the user equipment solve the problems, implementation of the base station and the user equipment may refer to the implementation of the methods, and repetitive contents will not be reiterated in this context.
  • FIG. 13 is a structural diagram of a user equipment according to Embodiment 7. As shown in FIG. 13 , the user equipment comprises a second resource processing unit 1301 , a second random access unit 1302 , a first determining unit 1303 and a second information transmitting unit 1304 ; wherein
  • the second resource processing unit 1301 does not release a resource used for transmitting an aperiodic SRS configured by a base station for the user equipment (UE) when the UE desynchronizes or the UE fails to transmit a scheduling request (SR) to the base station;
  • the second random access unit 1302 executes a random access procedure, in which the transmission of random access preamble may be initiated by itself or triggered by the base station;
  • the first determining unit 1303 determines whether to transmit the aperiodic SRS according to the type of indication information contained in a random access response message transmitted by the base station;
  • the second information transmitting unit 1304 transmits the aperiodic SRS on the resource configured by the base station for the UE to transmit the aperiodic SRS, when the UE determines to transmit the aperiodic SRS.
  • the operational flow of the UE is similar to that of Embodiment 3, and is hence not repetitively described here.
  • the first determining unit 1303 may include the component parts as described below.
  • FIG. 14 is a structural diagram of the first determining unit of Embodiment 7. As shown in FIG. 14 , the first determining unit includes a first receiving unit 1401 , a first information acquiring unit 1402 and a second determining unit 1403 ; wherein
  • the first receiving unit 1401 receives the RAR message transmitted from the base station
  • the first information acquiring unit 1402 correspondingly processes the RAR message according to the preconfigured format of the RAR message so as to acquire indication information contained in the RAR message;
  • the second determining unit 1403 determines to transmit the aperiodic SRS when the type of the indication information shows to transmit the aperiodic SRS, and determines not to transmit the aperiodic SRS when the type of the indication information shows not to transmit the aperiodic SRS.
  • the operational flow of the first determining unit as shown in FIG. 14 is similar to the flow as shown in FIG. 5 , and is hence not repetitively described here.
  • the UE processes the received RAR message according to the format of the RAR message preconfigured by the base station and corresponding to the type of the random access, and processes the RAR message according to the preconfigured format in the case of the contention-free random access; in the case of contention-based random access, the RAR message is processed according to the preconfigured format; only when the RAR message is processed by using the format corresponding to the contention-free random access and the acquired indication information indicates to transmit the aperiodic SRS, the UE determines to transmit the aperiodic SRS.
  • the first determining unit 1303 may include the component parts as described below:
  • FIG. 15 is a structural diagram of the first determining unit of Embodiment 7. As shown in FIG. 15 , the first determining unit includes a second receiving unit 1501 , a third determining unit 1502 , a second information acquiring unit 1503 and a fourth determining unit 1504 ; wherein
  • the second receiving unit 1501 receives an RAR message transmitted from the base station
  • the third determining unit 1502 determines whether the type of the random access is contention-free or contention-based random access
  • the second information acquiring unit 1503 correspondingly processes the RAR message according to the preconfigured format of the RAR message corresponding to the type of the random access when the type of the random access is the contention-free random access, so as to acquire indication information contained in the RAR message;
  • the fourth determining unit 1504 determines to transmit the aperiodic SRS when the type of the indication information shows to transmit the aperiodic SRS.
  • the operational flow of the first determining unit as shown in FIG. 15 is similar to the flow as shown in FIG. 6 , and is hence not repetitively described here.
  • the user equipment may further include an information receiving unit 1305 for receiving resource information from the base station configured by the base station for the UE to transmit the aperiodic SRS; or for further receiving format information of the RAR message configured by the base station; or for further receiving format information of the RAR message corresponding to the type of the random access configured by the base station.
  • an information receiving unit 1305 for receiving resource information from the base station configured by the base station for the UE to transmit the aperiodic SRS; or for further receiving format information of the RAR message configured by the base station; or for further receiving format information of the RAR message corresponding to the type of the random access configured by the base station.
  • the UE may further include a storing unit 1306 for storing the received resource information or format information for use by the UE to acknowledge and transmit the aperiodic SRS.
  • the UE does not release the resource used for transmitting an aperiodic SRS configured by the base station for the UE, if the UE desynchronizes or the UE fails to transmit a scheduling request (SR) to the base station; it is possible to determine to transmit the aperiodic SRS according to the indication information in the random access response message of the random access procedure transmitted by the base station, and to transmit the aperiodic SRS on the unreleased resource, so that the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for a transmission of uplink data of the UE.
  • SR scheduling request
  • FIG. 16 is a structural diagram of a base station according to Embodiment 8. As shown in FIG. 16 , the base station includes a third receiving unit 1601 , a message generating unit 1602 and a third information transmitting unit 1603 ; wherein
  • the third receiving unit 1601 receives a random access preamble transmitted by a user equipment (UE), wherein the user equipment transmits the random access preamble on its own initiative, or the user equipment transmits the random access preamble based on triggering by the base station;
  • UE user equipment
  • the message generating unit 1602 generates a corresponding random access response message according to a preconfigured format of the random access response message or according to a preconfigured format of the random access response message corresponding to the type of the random access, wherein the random access response message contains therein indication information indicating the user equipment whether to transmit the aperiodic sounding reference symbol;
  • the third information transmitting unit 1603 transmits the random access response message to the user equipment (UE), so that the UE determines whether to transmit the aperiodic sounding reference symbol according to the type of the indication information contained in the random access response message.
  • UE user equipment
  • the base station further comprises a transmitting unit (not shown in the drawings) for transmitting to the UE a preamble sequence and a resource for performing the random access procedure, so as to trigger the UE to transmit the random access preamble.
  • a transmitting unit (not shown in the drawings) for transmitting to the UE a preamble sequence and a resource for performing the random access procedure, so as to trigger the UE to transmit the random access preamble.
  • the operational flow of the UE is similar to that of Embodiment 4, and is hence not repetitively described here.
  • the base station further includes a first configuring unit 1604 and a first transmitting unit 1605 ; wherein
  • the first configuring unit 1604 configures for the UE resource information used for transmitting the aperiodic SRS, and the first transmitting unit 1605 transmits the configured resource information to the UE through radio resource control signaling.
  • the base station may further include a second configuring unit 1606 and a second transmitting unit 1607 , wherein the second configuring unit 1606 configures a format of the RAR message for the UE, and the second transmitting unit 1607 notifies the UE of the configured format of the RAR message, so that the UE correspondingly processes the received RAR message according to the format of the RAR message.
  • the second configuring unit 1606 configures a format of the RAR message for the UE
  • the second transmitting unit 1607 notifies the UE of the configured format of the RAR message, so that the UE correspondingly processes the received RAR message according to the format of the RAR message.
  • the base station may further include a third configuring unit 1608 and a third transmitting unit 1609 , wherein the third configuring unit 1608 configures a format of the RAR message corresponding to the type of the random access for the UE, and the third transmitting unit 1609 notifies the UE of the configured format of the RAR message corresponding to the type of the random access, so that the UE correspondingly processes the received random access response message according to the type of the random access and the format of the random access response message corresponding to the type of the random access.
  • the third configuring unit 1608 configures a format of the RAR message corresponding to the type of the random access for the UE
  • the third transmitting unit 1609 notifies the UE of the configured format of the RAR message corresponding to the type of the random access, so that the UE correspondingly processes the received random access response message according to the type of the random access and the format of the random access response message corresponding to the type of the random access.
  • the base station can preconfigure the resource set for the user equipment to transmit the aperiodic SRS and the format of the RAR message, and notify the UE; when the UE desynchronizes or fails to transmit a scheduling request (SR), the UE does not release the resource configured for it by the base station to transmit the aperiodic SRS; it is possible to determine to transmit the aperiodic SRS according to the indication information in the random access response message of the random access procedure transmitted by the base station, and to transmit the aperiodic SRS on the unreleased resource, so that the base station rapidly obtains uplink channel state information (CSI) of the UE to thereby rapidly perform scheduling for a transmission of uplink data of the UE.
  • CSI uplink channel state information
  • Certain embodiments further provides a computer-readable program, wherein when the program is executed in a user equipment, the program enables the computer to carry out the method for triggering an aperiodic sounding reference symbol according to Embodiment 1 or Embodiment 3 in the user equipment.
  • Certain embodiments further provides a storage medium in which a computer-readable program is stored, wherein the computer-readable program enables the computer to carry out the method for triggering an aperiodic sounding reference symbol according to Embodiment 1 or Embodiment 3 in a user equipment.
  • Certain embodiments further provide a computer-readable program, wherein when the program is executed in a base station, the program enables the computer to carry out the method for triggering an aperiodic sounding reference symbol according to Embodiment 4 in the base station.
  • Certain embodiments further provide a storage medium in which a computer-readable program is stored, wherein the computer-readable program enables the computer to carry out the method for triggering an aperiodic sounding reference symbol according to Embodiment 4 in the base station.
  • the aforementioned devices and methods of the present invention may be implemented by hardware or by hardware in combination with software.
  • the present invention relates to such a computer-readable program that, when executed by a logical component part, enables the logical component part to implement the aforementioned devices or component parts, or enables the logical component part to realize the aforementioned methods or steps.
  • the present invention further relates to a storage medium for storing the program, such as a hard disk, a magnetic disk, an optical disk, a DVD, or a flash memory, and so on.

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